(19)
(11) EP 4 477 288 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.03.2025 Bulletin 2025/10

(43) Date of publication A2:
18.12.2024 Bulletin 2024/51

(21) Application number: 24195128.4

(22) Date of filing: 15.05.2015
(51) International Patent Classification (IPC): 
C01D 1/22(2006.01)
D21C 11/00(2006.01)
 C01F 11/18(2006.01)
B01D 9/00(2006.01)
(52) Cooperative Patent Classification (CPC):
C01F 11/181; C01F 11/183; D21C 11/0078; C01F 11/182; Y02P 40/40; B01D 9/0036; Y02C 20/40
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 19.05.2014 US 201414281430

(62) Application number of the earlier application in accordance with Art. 76 EPC:
15728958.8 / 3145866

(71) Applicant: Carbon Engineering ULC
Squamish, BC V8B 0A2 (CA)

(72) Inventors:
  • HEIDEL, Kenton Robert
    T3A 2V9 Calgary (CA)
  • RITCHIE, Jane Anne
    T3L 3C5 Calgary (CA)
  • VOLLENDORF, Nicholas
    53151 New Berlin (US)
  • FESSLER, Eric
    53045 Brookfield (US)
  • KEITH, David William
    T2T 2H7 Calgary (CA)

(74) Representative: Fish & Richardson P.C. 
Highlight Business Towers Mies-van-der-Rohe-Straße 8
80807 München
80807 München (DE)

   


(54) RECOVERING A CAUSTIC SOLUTION VIA CALCIUM CARBONATE CRYSTAL AGGREGATES


(57) Techniques for growing crystalline calcium carbonate solids such that the crystalline calcium carbonate solids include a volume of 0.0005mm3 to 5mm3, include a slaker to react quicklime (CaO) and a low carbonate content fluid to yield a slurry of primarily slaked lime (Ca(OH)2); a fluidized-bed reactive crystallizer that encloses a solid bed mass and includes an input for a slurry of primarily slaked lime, an input for an alkaline solution and carbonate, and an output for crystalline calcium carbonate solids that include particles and an alkaline carbonate solution; a dewatering apparatus that includes an input coupled to the crystallizer and an output to discharge a plurality of separate streams that each include a portion of the crystalline calcium carbonate solids and alkaline carbonate solution; and a seed transfer apparatus to deliver seed material into the crystallizer to maintain a consistent mass of seed material.







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